With a typical sample containing 400 ppb, how often should I change the electrolyte?
The electrolyte must be replaced when the background signal is usually high and analyzer is unable to be adjusted to zero. A high level could be the result of dissolved O2 in the solution which occurs when the sensor is exposed to high O2 concentrations for long periods of time. This also occurs when the analyzer has been in use for a long period of time. Also to keep in mind is the Cadmium anode usage – when the O2 is reduced at the cathode, cadmium is oxidized producing Cadmium +2 ions in the electrolyte. Replacing the electrolyte will reduce the high level of ions which build up in the solution when the analyzer is in use for a long period of time. For best results, it is recommended to change the electrolyte once a year to 1-1/2 yr. Replacement instructions are in the manual.
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